null safety and also used to enforce arguments. not to handle overhead

Author: kevinmainairungu

app/build.gradle

@@ -49,6 +49,7 @@ android {
 
 dependencies {
     implementation fileTree(include: ['*.jar'], dir: 'libs')
+
     // Kotlin
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$version_kotlin"
 
@@ -60,7 +61,8 @@ dependencies {
 
     // Material Design
     implementation "com.google.android.material:material:$version_material"
-    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
-    implementation 'androidx.navigation:navigation-fragment-ktx:2.0.0'
-    implementation 'androidx.navigation:navigation-ui-ktx:2.0.0'
+
+    // Navigation
+    implementation "android.arch.navigation:navigation-fragment-ktx:$version_navigation"
+    implementation "android.arch.navigation:navigation-ui-ktx:$version_navigation"
 }

app/src/main/java/com/example/android/navigation/GameOverFragment.kt

@@ -31,9 +31,9 @@ class GameOverFragment : Fragment() {
         // Inflate the layout for this fragment
         val binding: FragmentGameOverBinding = DataBindingUtil.inflate(
                 inflater, R.layout.fragment_game_over, container, false)
-        binding.tryAgainButton.setOnClickListener { view : View ->
-            view.findNavController().navigate(R.id.action_gameOverFragment2_to_gameFragment)
+        binding.tryAgainButton.setOnClickListener { view: View ->
+            view.findNavController().navigate(GameOverFragmentDirections.actionGameOverFragment2ToGameFragment())
         }
         return binding.root
     }
-}
+}

app/src/main/java/com/example/android/navigation/GameWonFragment.kt

@@ -34,12 +34,14 @@ class GameWonFragment : Fragment() {
         // Inflate the layout for this fragment
         val binding: FragmentGameWonBinding = DataBindingUtil.inflate(
                 inflater, R.layout.fragment_game_won, container, false)
-        binding.nextMatchButton.setOnClickListener{view: View ->
-            view.findNavController().navigate(GameFragmentDirections.actionGameFragmentToGameWonFragment(numQuestions, questionIndex))
-
+        binding.nextMatchButton.setOnClickListener { view: View ->
+            view.findNavController().navigate(
+                    GameWonFragmentDirections.actionGameWonFragmentToGameFragment())
         }
-        val args = GameWonFragmentArgs.fromBundle(arguments!!)
-        Toast.makeText(context, "NumCorrect: ${args.numCorrect}, NumQuestions: ${args.numQuestions}", Toast.LENGTH_LONG).show()
+        var args = GameWonFragmentArgs.fromBundle(arguments!!)
+        Toast.makeText(context,
+                "NumCorrect: ${args.numCorrect}, NumQuestions: ${args.numQuestions}",
+                Toast.LENGTH_LONG).show()
         return binding.root
     }
 }

app/src/main/java/com/example/android/navigation/TitleFragment.kt

@@ -15,31 +15,25 @@ import com.example.android.navigation.databinding.FragmentTitleBinding
  * A simple [Fragment] subclass.
  */
 class TitleFragment : Fragment() {
-
     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                               savedInstanceState: Bundle?): View? {
-//        create a binding object and then inflate it in a layout using  LayoutInflater
-        val binding : FragmentTitleBinding = DataBindingUtil.inflate(
+        val binding: FragmentTitleBinding = DataBindingUtil.inflate(
                 inflater, R.layout.fragment_title, container, false)
-//        navigation controller from the navigation host fragment being attached to a button it generates an callable action from one fragment to the other
-        binding.playButton.setOnClickListener(
-                Navigation.createNavigateOnClickListener(R.id.action_titleFragment_to_gameFragment)
-        )
-//        set the activity to have an instance of the menu before  you override its functions. (Has two functions)
-        setHasOptionsMenu(true)
-            return binding.root
+        binding.playButton.setOnClickListener { v: View ->
+            v.findNavController().navigate(TitleFragmentDirections.actionTitleFragmentToGameFragment())
         }
+        setHasOptionsMenu(true)
+        return binding.root
+    }
 
-    //    create a new menu resource
     override fun onCreateOptionsMenu(menu: Menu?, inflater: MenuInflater?) {
         super.onCreateOptionsMenu(menu, inflater)
         inflater?.inflate(R.menu.overflow_menu, menu)
     }
-// override on options selected
+
     override fun onOptionsItemSelected(item: MenuItem?): Boolean {
         return NavigationUI.onNavDestinationSelected(item!!,
-        view!!.findNavController())
-//                override the Navigation.onOptionsItemSelected method when it fails to find a view and set the item selected as the navigation
+                view!!.findNavController())
                 || super.onOptionsItemSelected(item)
     }
-}
+}

build.gradle

@@ -29,7 +29,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.3.0'
+        classpath 'com.android.tools.build:gradle:3.6.3'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$version_kotlin"
         classpath "android.arch.navigation:navigation-safe-args-gradle-plugin:$version_navigation"
 

gradle/wrapper/gradle-wrapper.properties

@@ -1,23 +1,7 @@
-#
-# Copyright 2018, The Android Open Source Project
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-#
-
-#Tue Apr 17 15:14:16 PDT 2018
+#Fri May 01 10:29:28 EAT 2020
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
-zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-4.10.1-all.zip
 android.databinding.enableV2=true
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip